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"It has been many years since Ros Lai was brought to Coruscant. She may not even be alive."

―Plo Koon to Yoda, discussing the alliance with the Nightsisters and the Separatists[src]

Ros Lai during the Clone Wars

Lai was the daughter of NightsisterQueenZalem and an unknown Jedi Knight. When she was very young, her mother killed her father, beginning a resentment which would last the rest of her life.

Quietly plotting her revenge, Ros used the Force to transform her appearance. Because of her disguise as a hideously deformed old hag, the other women of the clan called her "the Rancor". She was relegated to the lowly position of tending to the slaves. It was in this capacity that she discovered Quinlan Vos. Posing as a slave, Vos was investigating a plot by Lai's mother to reawaken the ancient power of the Infinity Gate. With Quinlan's help, she killed her mother in an attempt to take control of her clan and the Infinity Gate. Quinlan went to the gun, so that the Infinity Gate would be destroyed. He fled with Ros Lai in Yag's starship to Coruscant where she was taken into custody. His reason to have Ros Lai alive was that he felt that there was good in her.

In 28 BBY she self-published her memoirs, though people didn't believe her story at the time.[2]